Neural selectivity for hue and saturation of colour in the primary visual cortex of the monkey
Neural selectivity for hue and saturation of colour in the primary visual cortex of the monkey
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DOI：
10.1046/j.1460-9568.2000.00041.x
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发表时间：
2000-05-01
影响因子：
3.4
通讯作者：
Murakami, I
中科院分区：
文献类型：
--
作者：
Hanazawa, A;Komatsu, H;Murakami, I
在猴子的下颞叶皮层（IT）中，已经显示出在颜色辨别中起关键作用，有神经元对窄范围的色调和饱和度敏感。相比之下，在视网膜和小细胞层的外侧膝状体核（pLGN）的神经元编码颜色的方式，不提供显式的表示色调或饱和度，和色调和饱和度的选择性的过程中阐述仍然是未知的。因此，我们测试了初级视皮层（V1）神经元的颜色选择性，并将其与pLGN和IT神经元进行了比较。使用系统地分布在CIE（Commission Internationale de l 'Eclairage）-xy色度图内的一组标准颜色进行定量分析。色调和饱和度的选择性通过分析反映整个色度图上响应的总体分布的响应轮廓来表征。我们发现，几乎所有的pLGN神经元的响应轮廓是线性的，并广泛调整色调。许多V1神经元的行为相似;尽管如此，相当数量的V1神经元具有明显弯曲的反应轮廓，并且对窄范围的色调或饱和度具有选择性。在V1和IT皮层中，对色调和饱和度表现出各种选择性的神经元的相对频率非常相似，但在pLGN中明显不同。因此，V1显然起着非常重要的作用，在转换的颜色信号产生复杂的颜色选择性观察到的IT皮层。
In the inferior temporal (IT) cortex of monkeys, which has been shown to play a critical role in colour discrimination, there are neurons sensitive to a narrow range of hues and saturation. By contrast, neurons in the retina and the parvocellular layer of the lateral geniculate nucleus (pLGN) encode colours in a way that does not provide explicit representation of hue or saturation, and the process by which hue- and saturation-selectivity is elaborated remains unknown. We therefore tested the colour-selectivity of neurons in the primary visual cortex (V1) and compared it with those of pLGN and IT neurons. Quantitative analysis was performed using a standard set of colours, systematically distributed within the CIE (Commission Internationale de l'Eclairage)-xy chromaticity diagram. Selectivity for hue and saturation was characterized by analysing response contours reflecting the overall distribution of responses across the chromaticity diagram. We found that the response contours of almost all pLGN neurons were linear and broadly tuned for hue. Many V1 neurons behaved similarly; nonetheless, a considerable number of V1 neurons had clearly curved response contours and were selective for a narrow range of hues or saturation. The relative frequencies of neurons exhibiting various selectivities for hue and saturation were remarkably similar in the V1 and IT cortex, but were clearly different in the pLGN. Thus, V1 apparently plays a very important role in the conversion of colour signals necessary for generating the elaborate colour selectivity observed in the IT cortex.